Be warned that this is very early, and that everything is subject to
change. I'd like to thank everyone on this list for their input, and
I hope that all contributors will see at least some of their
suggestions implemented (even if they're annoyed that others have been
passed over).

You also need the SAX 1.0 distribution to use SAX2. SAX2 does not
replace SAX 1.0, but it does augment it by adding additional
functionality for those who want it; for now, the feature/property
setting and discovery is being handled through a separate interface.
People are encouraged to start supporting SAX2, but SAX 1.0
implementations will not become obsolete.

Here's what's in the SAX2 core:

package org.xml.sax

interface Configurable

class SAXNotSupportedException (extends SAXException)

class SAXNotRecognizedException (extends SAXNotSupportedException)

package org.xml.sax.misc

interface DeclHandler

interface LexicalHandler

interface NamespaceHandler

package org.xml.sax.helpers

class ConfigurableParserAdapter (implements Parser, Configurable)

I've also hacked together a simple SAX2 wrapper for Microstar's
AElfred SAX 1.0 driver, which more-or-less correctly reports what
features are available (such as external entity expansion) and
unavailable (such as validation). It is available through a separate
download.

Note that even SAX2 parsers are free not to implement any or all of
the core features and properties.